| Self Pollination | Cross Pollination |
| Flowers. It is the transfer of pollen grains from anther to stigma of same or similar flower. | It is the transfer of pollen grains from the anther of one flower to the stigma of another flower. |
| Agency. An external agency is not required. | An external agency is required for carrying of pollen grains from one flower to another. |
| Variations. It does not produce variations. | It brings about a lot of variations. |
| Vigour. There is a slow loss of vigour in self pollinated plants. | Vigour of the plants is maintained. |